An efficient and facile synthesis of benzimidazo[1,2-a]benzimidazoles via copper-catalyzed domino addition/double cyclization

Abstract

A variety of benzimidazo[1,2-<italic>a</italic>]benzimidazole derivatives were efficiently and facilely assembled from bis-(<italic>o</italic>-haloaryl)carbodiimides and primary amines through a Cu-catalyzed domino addition/double cyclization process.